fix bootloader and add docs, minor fix to hello

06_IO_Devices/01_UartTX/hello.asm

@@ -3,8 +3,9 @@
 // 
 // Put your code here:
 
-// Never 
-// 78 101 118 101 114 32
+// send "Never Graduate!" on UART_TX
+// read BUT[1,2] and write to LED[1,2]
+
 @78
 D=A
 @128
@@ -29,8 +30,6 @@ M=D //r
 D=A
 @133
 M=D // space
-// Graduate!
-// 71 114 97 100 117 97 116 101 33 32
 @71
 D=A
 @134
@@ -67,10 +66,14 @@ M=D //e
 D=A
 @142
 M=D //!
-@10
+@13
 D=A
 @143
-M=D // newline
+M=D // carriage return
+@10
+D=A
+@144
+M=D // line feed
 @128
 D=A
 @CHARBOOT
@@ -102,7 +105,7 @@ D=M
 M=D
 @CHARBOOT
 M=M+1
-@144
+@145
 D=A
 @CHARBOOT
 D=D-M
@@ -114,5 +117,3 @@ D;JEQ
 (ENDBOOT)
 @POLL
 0;JMP
-
-

06_IO_Devices/05_GO/boot.asm

@@ -4,6 +4,41 @@
 //
 // Put your code here:
 
+
+// @R0
+// D=M
+//
+// // Shift left by 8 bits by doubling 8 times
+// D=D+D   // Shift left by 1 bit
+// D=D+D   // Shift left by another bit
+// D=D+D   // Shift left by another bit
+// D=D+D   // Shift left by another bit (4-bit shift so far)
+// D=D+D   // Shift left by another bit
+// D=D+D   // Shift left by another bit
+// D=D+D   // Shift left by another bit
+// D=D+D   // Shift left by another bit (now D contains 0xEA00)
+//
+// D=M -> 1111110000010000
+// M=D -> 1110001100001000
+// M=0 -> 1110101010001000
+//
+// // Store the result in R1
+// @R1
+// M=D
+//
+//
+// 00010000          0 -> add 8 times and store to lhs
+// 00000001          1 -> add to lhs and store to word
+// 0001000000000001  write all the words to sram
+//
+// 0001000000000001
+// 1111110001010000
+// 0001000000000000
+// 1110001100001000
+// 0000000000000000
+// 1110101010000111
+
+
 // read data starting at address
 // 0x03 0x01 0x00 0x00
     @3
@@ -48,7 +83,7 @@
         @DECR2
         D;JGT
 
-//command stack base address 
+//command stack base address
     @100
     D=A
     @READCOMMAND
@@ -120,7 +155,7 @@
 (WESTWORD)
     @SPI
     D=M
-    @R13
+    @DEBUG0
     M=D
     DM=D+M
     DM=D+M
@@ -142,11 +177,11 @@
     M=D
     @SPI
     D=M
-    @R14
+    @DEBUG1
     M=D
-    @R13
+    @DEBUG0
     D=M
-    @R14
+    @DEBUG1
     D=D+M
     @SRAM_D
     M=D
@@ -154,7 +189,7 @@
     M=0
     @WORDCOUNT
     M=M+1
-    @6
+    @57343
     D=A
     @WORDCOUNT
     D=D-M